I need a case for my gigabit mobo. I'm not sure how much the mount points differ but I saw a quicksilver case on ebay.
http://cgi.ebay.com/Apple-Power-Mac-G4-QuickSilver-Case-Enclosure-Chassis_W0QQitemZ5872855869QQcategoryZ80032QQrdZ1QQcmdZViewItem
Think it would work?